This plugin don't check your syntax whether is corrected. You should invoke compiler to do it before use this plugin.

install details

Installation
This plugin follows the standard runtime path structure, and as such it can be installed plugin manager :
Pathogen
$ cd ~/vimfiles/bundle
$ git clone https://github.com/kdurant/verilog-testbench.git verilog-testbench
manual:
copy all of the files into your ~/vimfiles/directory